Board drop hammer



Juiy 23, 1935. M. s. REED BOARD DROP HAMMER Filed .June 8, 1932 2 Sheets-Sheet l MLJMM JUQWL IN V EN TOR.

ATTORNEYS.

July 23, 1935. M. s. REED BOARD DROP HAMMER Fi led June 8, 1932 2 Sheets-Sheet 2 INVENTOR.

7'72 ZMf ATTORNEYS.

Patented July 23, 1935 31590 3 .j;BoARn-.:nnor HAMMER Ma'edonaldfs; Reed, Erie, Pas assigiibrjito Erie i Foundry "Company; Erie; Paz', a corporation of Pennsylvania 1 i Application June 8, 1932, S erial No 4 Claims. (o1. 7829) The present invention is designed to improve board drop hammers. Such hammers have been heretofore driven from different sources of power, but usually through gearing between the source of power and the rolls. The present invention is designed to simplify the mechanism byarranging electric motors directly within the rolls, thus doing away with all gearing and simplifying the structure. Features and details of the invention will appear from the specification and claims.

7 A preferred embodiment of the invention is illustrated in the accompanying drawings as fol lows:-

Fig. 1 shows a front elevation of a hammer.

Fig. 2 a view of the starting and stopping mechanism, the parts being detached.

Fig. 3 an enlarged view of the trip mechanism.

Fig. 4 a section on the line 44 in Fig. 3.

Fig. 5 a plan view, partly in section, of the rolls.

Fig. 6 a section on the line 66 in Fig. 5.

I marks the frame, 2 the head, 3 the base, 4 the ram, or hammer head, 5 the die on the base, 6 the board secured to the hammer head, 1 the rolls, 8 shafts on which the rolls are journaled, 9 eccentrics carrying the shafts, ID the operating lever of the normally movable roll actuated by the friction bar H, and I2 lever arms from the eccentrics of the normally fixed roll,'these arms being joined by a pin IS on which is mounted a rod M for adjusting the normally fixed roll.

The eccentrics are journaled in bearings l5 in the head. Locking fingers iii are secured on the ends of the shafts and extend into sockets I! in brackets IS on the side of the'head. These fingers lock the shafts against turning, but permit them to move in response to the action of th eccentrics.

Stopping and starting mechanism of the usual form involve clamping arms I 9 which are mounted on brackets 20 on the head. The arms are operated by a lever 2| secured to an eccentric pivot pin 22 of one of the arms. A link 23 extends from the arm 2| to a lever 24. The lever 24 is mounted on a pin 25. A link 26 extends from the lever 24 to a rock arm 21. The rock arm is mounted on a shaft 28 and the shaft 28 is journaled in bearings 29 on the base. A second rock arm 21a is fixed on the shaft 28 and a pedal 30 extends from one rock arm to theother. When the pedal is depressed the clamping arms I9 are opened and when relieved they are closed so as to catch the board on the next upward movement in the usual manner.

The trip mechanism is of the usual form and involves the block 32 on the friction bar II. ,A stop 33 is adapted to move under this block to hold the frictionbar in its upper position. The stop 33 is connected by a screw 34 with an extension 35 on a bolt 36. The screw is extended forming a bolt extension 38 and this extends through a guide lug 39 on the'frame. A spring 40 is arranged around the extension 38 and operates against the bolt to crowd it forward. The bolt 36 extends through a strap 4|. A stop 42 engages the strap and definitely locates the bolt in its forward position. The bolt terminates in a cam surface 43 which is engaged by a cam surface 44 on the head. As the head is dropped, the cam surfaces operating on the bolt withdraw the stop 33 and move it out from under the block 32 permitting the rod II to drop and close the rolls so as to lift the head. This trip mechanism is of the usual construction.

In order to lift the rod II and thus open the rolls, to permit the hammer head to drop, the following mechanism is provided: A lever 45 is pivoted on a pin 46. The pin 46 extends from the rod I I. A block 41 is pivotally mounted on a pin 48 and the pin is adjustably mounted on the frame. The block 4'! slides in a slot 49 on the lever 45. The lever is in the path of a pin 50 extending from the hammerhead. As the hammer is lifted, the pin 50 engages the lever, forces the rod I l upwardly and opens the rolls, thus permitting the hammer to drop. This lever mechanism is of usual construction.

Arranged within each of the rolls is an electric motor having a stator 5| fixed on the shaft 8. The rotor 52 of the motor. is carried by and moves with the roll, being preferably encased in a roll shell 53. The roll has heads 54 and these have bearings 55 which are journaled on the shaft. One head 56 of each of the rolls is considerably larger than the roll and. overlaps axially and radially the companion roll. These heads 56 are provided with large masses and operate as fly wheels for the rolls.

The shafts are provided with openings 5'! through which the wiring is carried to the motor.

The control and operation of the hammer is identical with board hammers in common use, the inventive feature of the structure residing in the manner of driving the rolls.

What I claim as new is:-

1". In a board drop hammer, the combination of a frame; a hammer head; a board; actuating moving with and driving the roll and a fixed stator mounted within the roll; and a rotating head on one of the rolls overlapping radially the companion roll.

2. In a board drop hammer, the combination of a frame; a hammer head; a board; actuating rolls operating on the board; means opening and closingthe rolls on the board; an electric motor within at least one ofthe rolls having a rotor moving with and driving the roll and a fixed stator mounted within the roll; and rotating heads on opposite ends of the rolls, each head radially overlapping the companion roll. V V

3. In a board hammer, the combination of a frame; a hammer head; a board therefor; a

board actuating roll; a shaft on which the roll is mounted; eccentrics journaled in the frame and on the shaft; means actuating the eccentrics; means locking the shaft against rotation; an electric motor within the roll comprising a rotor moving with the roll and a stator locked with the shaft; and a companion board r011 operating with said board actuating roll.

4. In a board hammer, the combination of a frame; a hammer head; a board therefor; board actuating rolls operating on the board; shafts on. which each of the rolls is journaled; a pair of eccentrics journaled in the frame and on the shafts; means operating each pair of eccentrics; means locking each shaft against rotation; and an electric motor in each roll comprising a rotor moving with the roll and a stator locked with 15 the shaft.

MACDONALD S. REED. 

